GB1026909A - A method of separating pure phthalic anhydrine from an oxidised ú´-xylene reaction product - Google Patents

A method of separating pure phthalic anhydrine from an oxidised ú´-xylene reaction product

Info

Publication number
GB1026909A
GB1026909A GB12541/65A GB1254165A GB1026909A GB 1026909 A GB1026909 A GB 1026909A GB 12541/65 A GB12541/65 A GB 12541/65A GB 1254165 A GB1254165 A GB 1254165A GB 1026909 A GB1026909 A GB 1026909A
Authority
GB
United Kingdom
Prior art keywords
stage
phthalic anhydride
anhydrine
oxidised
reaction product
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB12541/65A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of GB1026909A publication Critical patent/GB1026909A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54—Preparation of carboxylic acid anhydrides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/14—Monocyclic dicarboxylic acids
    • C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
    • C07C63/16—1,2 - Benzenedicarboxylic acid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D307/87—Benzo [c] furans; Hydrogenated benzo [c] furans
    • C07D307/89—Benzo [c] furans; Hydrogenated benzo [c] furans with two oxygen atoms directly attached in positions 1 and 3

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Furan Compounds (AREA)

Abstract

Phthalic anhydride, which has been produced by oxidation of o-xylene, is purified by a three-stage distillation process carried out under reduced pressure. In the first stage, the impure phthalic anhydride is submitted to simple equilibrium distillation to distil over the bulk of the input leaving non-volatile impurities in the still. In the second stage, the distillate from the first stage is distilled in a rectification column and 0.5 to 5% of the input is withdrawn overhead. In the third stage, the sump liquid from the second stage is submitted to simple equilibrium distillation and the purified phthalic anhydride product is obtained as distillate. The pressure in the last stage is preferably about 8 mm. Hg; the first two stages may be carried out at a pressure between 100 and 200 mm. Hg. The reflux condenser of the second stage and the total condensers of the other two stages are maintained at temperatures above the melting point of phthalic anhydride, i.e. at a temperature exceeding 131 DEG C.
GB12541/65A 1964-03-24 1965-03-24 A method of separating pure phthalic anhydrine from an oxidised ú´-xylene reaction product Expired GB1026909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM60422A DE1227443B (en) 1964-03-24 1964-03-24 Process for the production of pure phthalic anhydride

Publications (1)

Publication Number Publication Date
GB1026909A true GB1026909A (en) 1966-04-20

Family

ID=7309824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12541/65A Expired GB1026909A (en) 1964-03-24 1965-03-24 A method of separating pure phthalic anhydrine from an oxidised ú´-xylene reaction product

Country Status (3)

Country Link
JP (1) JPS4822690B1 (en)
DE (1) DE1227443B (en)
GB (1) GB1026909A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503304B1 (en) * 1968-03-30 1975-02-03

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266748C2 (en) * 1966-05-21 1973-07-19 Basf Ag Process to prevent encrustation of heating surfaces during the continuous distillation of phthalic anhydride
DE1668398C3 (en) * 1967-07-07 1979-07-05 Metallgesellschaft Ag, 6000 Frankfurt Process for the production of pure phthalic anhydride
JPS5588697U (en) * 1978-12-15 1980-06-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503304B1 (en) * 1968-03-30 1975-02-03

Also Published As

Publication number Publication date
DE1227443B (en) 1966-10-27
JPS4822690B1 (en) 1973-07-07

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